Big Rock is located in Illinois. Big Rock, Illinois has population of 985. Big Rock is less family-centric than the surrounding county with 25% of the households with children.
The median household income in Big Rock, Illinois is $93,714. The median household income for the surrounding county is $82,067 compared to the national median of $66,222. The median age of people living in Big Rock is 47.5 years.
The average high temperature in July is 83.99 degrees, with an average low temperature in January of 10.43 degrees. The annual precipitation is 38.04.
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